OFFSET
1,1
COMMENTS
Column 1 of A183802.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = 6*a(n-1) + 81*a(n-2) + 206*a(n-3) + 144*a(n-4).
Empirical g.f.: x*(53 + 388*x + 866*x^2 + 576*x^3) / (1 - 6*x - 81*x^2 - 206*x^3 - 144*x^4). - Colin Barker, Apr 04 2018
EXAMPLE
Some solutions for 3 X 2:
..3..3....3..3....0..2....1..0....3..0....1..2....2..2....2..2....1..3....3..1
..0..2....3..2....1..1....2..2....0..2....3..3....0..0....2..2....0..1....2..1
..2..1....3..1....0..3....2..1....3..2....3..0....2..3....3..1....0..3....0..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 07 2011
STATUS
approved